Can I "mDust" a Hen with Chicks?

My Silkie has 4 babies, born on Monday. Can I dust her for mites while she has babies this young? If not, how old should they be before I can dust Mama. How old should cchicks be before they can be dusted? Its mite season and I had to dust several of my other hens, but I haven't done Mama as she was on the nest.